Git commits in Moodle 2.3.4 by Michael de Raadt

commit 254fef3a9c8f31ee8e5fec252da0c36f45d5efe3
Author: Michael de Raadt <michaeld@moodle.com>
Date:   Mon, 29 Oct 2012 17:58:51 +0800
Tag:    v2.3.4

MDL-35358 Lesson Module: fixed teacher grade essays display when lesson is only available for group members only